Canadian phenom Summer McIntosh claimed the first gold medal of her just-burgeoning career on Monday night with a dominating victory in the 400-metre individual medley.

McIntosh, 17, collected her first medal of any colour on the opening night of swimming, taking a silver in the 400 freestyle behind Ariarne Titmus and ahead of Katie Ledecky. Now, McIntosh has the most prized colour of all.